飞秒脉冲在共振介质中长距离演化过程研究
文献类型：期刊论文
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| 作者 | 吴佳文 ; 程静 ; 余向阳 ; 周建英 |
| 刊名 | 光学学报
 |
| 出版日期 | 2005 |
| 卷号 | 25期号:9页码:1265 |
| 关键词 | 量子光学 quantum optics 光与物质相互作用 light-matter interaction 时域有限差分 finite-difference time domain 麦克斯书-布洛赫方程 Maxwell-Bloch equations |
| ISSN号 | 0253-2239 |
| 其他题名 | Evolution of Femtosecond Pulse in Resonant Atomic Medium with Long Distance |
| 中文摘要 | 为研究飞秒脉冲在共振二能级原子介质中传播较长距离时的演化规律，用时域有限差分的方法数值模拟了5fs脉冲载波与共振介质相互作用的麦克斯韦-布洛赫方程。结果表明，5fs脉冲的包络与载波的形状基本吻合，变化趋势大体一致，慢变振幅近似和旋转波近似不影响基本结论。在脉冲在谱宽远大于原子介质跃迁线形增宽的条件下，3.2π脉冲演化成2π双曲正割脉冲所经历的过程非常复杂，达到稳态所通过的空间长度大约是面积演化成稳态值所需要的长度的5×10^4倍。因此，在短距离的面积演化过程中，飞秒脉冲无法保持双曲正割的脉冲形状，只有经过; To study the evolution of femtosecond (fs) laser pulse in a long-distance two-level medium, the Maxwell-Bloch equations of 5 fs carrier interaeting with two-level medium are numerically solved with use of finite-difference time domain procedure. It is found that the 5 fs pulse envelope, obtained within the slowly varying envelope approximation and rotating-wave approximation, agrees nicely with the carrier field. It is also found that it takes 50000 times longer distance for a pulse with an area of 3.2π to evolve into a stable symmetric hyperbolic-secant pulse than its area varying into a stable value. The evolution process is complicated, for the pulse's spectral width much larger than the atomic linewidth. As a result, an injected pulse with an area of 3.2π could not maintain a shape of symmetric hyperbolic-secant during its area evolving into stable, and must propagate a very long distance to transform into a stable solitary wave. In addition, comparison of the results of the 5 fs and 50 fs pulse has demonstrated that the shorter the pulse is, the more intricate process, the longer distance it needs. |
| 学科主题 | 光学;量子光学 |
| 分类号 | O431.2;O437 |
| 收录类别 | ei |
| 语种 | 中文 |
| 公开日期 | 2009-09-18 ; 2011-07-07 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/1163]  |
| 专题 | 上海光学精密机械研究所_量子光学重点实验室 |
| 推荐引用方式 GB/T 7714 | 吴佳文,程静,余向阳,等. 飞秒脉冲在共振介质中长距离演化过程研究, Evolution of Femtosecond Pulse in Resonant Atomic Medium with Long Distance[J]. 光学学报,2005,25(9):1265, 1270. |
| APA | 吴佳文,程静,余向阳,&周建英.(2005).飞秒脉冲在共振介质中长距离演化过程研究.光学学报,25(9),1265. |
| MLA | 吴佳文,et al."飞秒脉冲在共振介质中长距离演化过程研究".光学学报 25.9(2005):1265. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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